hi all im after some advice on piston choice i need to know some good places where i can get reasonable priced piston for a 30over 351 the forgies that are in my nmotor at the moment are cracked so would like to know where a good place is to get either some hypers or forgies that woulkd work well with a 351 that has been decked and on gas any questions or responses would be greatly appreciated

i bought the engine as is for $400 it has a cam and headwork and arp rod bolts but the fella that i got it off said that when the engine was built he used second hand forgies that where already 80% through there lifetime and they then cracked supposively i still havent taken the heads off to have a look yet but yeah was just wondering if their are any good places to go to get a good deal

Believe it or not it is quite common to break or crack trw forged pistons. Normally its the skirts that crack or break. Main reason is too much piston to bore clearance and usually in older engines with a lot of wear.

Believe it or not it is quite common to break or crack trw forged pistons. Normally its the skirts that crack or break. Main reason is too much piston to bore clearance and usually in older engines with a lot of wear.

That isn't a really piston problem--it is an assembly/machine problem. Clearances need to be observed and the recommended specs of about .0015" are a bit too much, IMO. I prefer to be at or near .0008" to .0010". This is too tight for nitrous use, though. I've found that .0012" is about perfect for most uses with .0015" to .0016" the maximum for a high output nitrous engine, but then I'd recommend a different piston than a TRW/Speed Pro/Sealed Power part.

That isn't a really piston problem--it is an assembly/machine problem.:davis:

I agree/disagree. We had a clown at the Ingham burnouts who had 30" TRW 12.5:1 Forged Lumpy tops and he did not warm the engine up to operating temp so we think the pistons expanded before the bores did and they scrapped the sides but did not crack them. Does that sound right ??? Or was the bore clearance not correct ???

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